[Spring] Java Spring XML Configuration

Java Spring XML Configuration

/ XML Configuration /

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- bean definitions here -->  
  
    <bean id="name" class="java.lang.String">  
        <constructor-arg value="Ranga" />  
    </bean>  
    <bean id="age" class="java.lang.Integer">  
        <constructor-arg value="35" />  
    </bean>  
    <!--   <context:component-scan  
            base-package="com.in28minutes.learnspringframework.game"/>     -->    <bean id="game" class="com.in28minutes.learnspringframework.game.PacmanGame"/>  
  
    <bean id="gameRunner"  
          class="com.in28minutes.learnspringframework.game.GameRunner">  
        <constructor-arg ref="game" />  
    </bean>  
</beans>

import java.util.Arrays;  
  
import org.springframework.context.support.ClassPathXmlApplicationContext;  
  
import com.in28minutes.learnspringframework.game.GameRunner;  
  
public class XmlConfigurationContextLauncherApplication {  
  
    public static void main(String[] args) {  
  
        try (var context =  
                     new ClassPathXmlApplicationContext("contextConfiguration.xml")) {  
  
            Arrays.stream(context.getBeanDefinitionNames())  
                    .forEach(System.out::println);  
  
            System.out.println(context.getBean("name"));  
  
            System.out.println(context.getBean("age"));  
  
            context.getBean(GameRunner.class).run();  
  
        }  
    }  
}

Annotations vs XML configuration

Heading	Annotations	XML Configuration
Ease of use	Very Easy (defined close to source - class,method and/or variable)	Cumbersome
Short and concise	Yes	No
Clean POJOs	No. POJOs are polluted with Spring Annotations	Yes. No change in Java code
Easy to Maintain	Yes	No
Usage Frequency	Alomost all recent projects	Rarely
Recommendation	Either of them is fine BUT be consistent	Do NOT mix both
Debugging difficulty	Hard	Medium

정리

• XML 로 bean을 주입하고 북치고 장구치고 가능하다.
• 사실 이전에는 XML로 작업했다고 한다.
• 하지만 옛날 방법이며 요즘에는 잘 사용하지 않는다고 한다.
• 나름대로 XML 의 장점도 위와 같이 어느정도 있다.
• 대부분 Annotation을 사용하지만 디버깅이 어렵다는 단점도 있다.
• 둘 다 좋은 방법이다. 섞어 쓰지만 않으면 된다.